These interference band-pass filters are used to isolate and transmit a specified narrow wavelength and reflect all other incident wavelengths.
Knight Optical's stock range of high quality standard bandwidth visible type interference filters is available from 330nm-2000nm in various bandwidths to meet most requirements, such as imaging and instrumentation. This visible range has a standard 45-50% transmission however some common wavelengths are stocked with a high 70% transmission (See FIJ type filters).
The individual filters are CNC scribed and hermetically sealed to form a stack in their rings, ensuring maximum long-term stability. Although our standard stock range is mounted, un-mounted types with aerospace paint blackened edges can be supplied at request. All our interference bandpass filters are supplied with a transmission curve.
For more information on our stock range of interference bandpass filters, or to enquire about a custom quote, please contact our technical sales team.
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Diameter & Aperture (mm):
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12.5mm ± 0.2 (8.5mm aperture) 25.0mm ± 0.2 (21mm aperture) 50.0mm ± 0.2 (46mm aperture) 6.1mm +/-0.2 <0.01% (OD4) @ 200nm to 1150nm (for filters with CWL less than 380nm) <0.001% (OD5) @ 200nm to 1150nm (for filters with CWL between 380nm and 1064) <0.001% (OD5) @ 200nm to 1850nm (for filters with CWL between 1080nm and 1640) <0.01% (OD4) see individial specifications for range for filters with CWL 1660nm and upwards. ± 20% of FWHM ± 20% of FWHM 23°C Mounted in black anodized aluminium ring In most cases {Knight Optical Part#} - {KOLTD} - arrow in direction of light path 80/50 -50°C to +80°C Typical 3 cavity design All filters are scribed and hermetically sealed to ensure maximum long-term stability (Information sheet on scribed interference filters) |
Please telephone our technical sales or email with your specification.
Dielectrically blocked filters are available for increased performance.
Stock filters can be supplied in pre-mounted threaded rings.
Other bespoke sizes to your specification either mounted or un-mounted.
Unmounted interference filters available, sealed around edges with high quality aerospace paint.
Small one-off or small batch quantity for new projects at very competitive prices and normally delivered within 6 weeks.
Alternative imperial sizes are available at short notice, normally within 1-2 weeks.
12.7mm dia: 8.7mm dia aperture
25.4mm dia: 21.4mm dia aperture
50.8mm dia: 46.8mm dia aperture
| Name | CWL(nm) | Peak Transmission (%) | FWHM | Diameter (mm) | Thickness (mm) | Blocking Type | Avg. Blocking Range | Avg. Blocking OD | Price | Buy |
| 390DIB25 pdf | 390 | 37 | 10 | 25 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$152.90
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| 390DIB50 pdf | 390 | 37 | 10 | 50 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$410.05
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| 390FIB50 pdf | 390 | 37 | 10 | 50 | 6.1 | Silver | 200nm to 1150nm | 5 |
US$369.05
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| 400DIB12 pdf | 400 | 37 | 10 | 12.5 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$93.83
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| 400DIB25 pdf | 400 | 37 | 10 | 25 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$152.90
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| 400DIB50 pdf | 400 | 37 | 10 | 50 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$410.05
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| 400FIB50 pdf | 400 | 37 | 10 | 50 | 6.1 | Silver | 200nm to 1150nm | 5 |
US$369.05
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| 405DIB12 pdf | 405 | 37 | 10 | 12.5 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$93.83
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| 410DIB12 pdf | 410 | 40 | 10 | 12.5 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$93.83
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| 410DIB25 pdf | 410 | 40 | 10 | 25 | 6.1 | Dielectric | 200nm to 1150nm | 5 |
US$152.90
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